APFIVE Assumption of Mutual Exclusivity
A researcher surveyed 1,000 students about their test-taking strategies on a multiple-choice exam. The table shows the number of students who reported using each of three different strategies.
| Strategy | Count |
|---|---|
| Guess | 320 |
| Answer © | 350 |
| Longest Answer | 330 |
The sum of the counts in the table is 1,000. This result suggests which of the following potential errors in the researcher’s methodology?
A
Switching the roles of independent and dependent events in the calculation of joint probabilities.
B
Using rounding methods that inflated some percentages while deflating others.
C
Assuming that the strategies were mutually exclusive and therefore not needing to compute separate probabilities.
D
Failing to convert the counts into probabilities by dividing by the total sample size.
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